Evolution of Electrochemical Characteristics of Solid Oxide Fuel Cells During Initial-Stage Operation

Lyu, Zewei; Han, Minfang; Sun, Zaihong; Sun, Kaihua

doi:10.6023/a21020065

Cited by 2 publications

(2 citation statements)

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“…考虑到电池的输出电压 U 是在阳极电势的基础上减去阴极极化损失和欧姆极化损失, 因此当电压 U 高于电池的阳极支撑层和阳极功能层为 NiO-YSZ, 电解质为 YSZ, 隔离层为 GDC (Gd 0.1 Ce 0.9 O 2-δ ), 阴极为 LSCF (La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ ). 电池的各层厚度及详细制备工艺流程可参考本课题组之前的工作 [24,[35][36] . 将制备好的电池装入端板后在温控电阻炉中进行测试, 阳极侧通入氢气, 阴极侧通入空气, 气体供应均由质量流量计(Sevenstar CS200A)进行控制.…”

Section: 电池阳极安全运行条件unclassified

“…电池在 720 ℃、阳极 1 L•min -1 (101.325 kPa, 0 ℃ 下体积, 下同)的氢气(以体积分数为 10%的水蒸气加湿), 阴极气氛为 3 L•min -1 空气的条件下还原 5 h. 之后在该条件下 10 A 恒流放电 48 h, 完成初期性能活化 [24,[35][36] , 进入稳定状态. 在对电池进行基本性能测试后, 开展探究电池效率的变工况测试.…”

Section: 电池阳极安全运行条件unclassified

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Study of Operating Conditions for High Efficiency and Anode Safety of Industrial-Size Solid Oxide Fuel Cell

Wang¹,

Li²,

Lyu³

et al. 2022

Acta Chimica Sinica

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Solid oxide fuel cell (SOFC) has been regarded as one of the promising energy conversion technologies since it provides higher efficiency and lower pollution than conventional power systems. How to improve the SOFC efficiency is one of the focus issues in both industry and academia. Besides, when industrial-size SOFC is operated at high fuel utilization (Ufuel) to achieve high efficiency, the Ni anode in the downstream region may be locally oxidized due to the high oxygen partial pressure. Thus, operating conditions for both high efficiency and anode safety are required. In this work, a method for the measurement and evaluation of SOFC efficiency was established. By comparing the test results under different conditions (current, fuel flow rate, and temperature) with high fuel utilization, it was found that at the same fuel utilization, the voltage decreased as the current increased. Therefore, the lower current is beneficial for higher efficiency, while the higher current is beneficial for higher power. The relationship between voltage fluctuation and local oxidation of anode during operation at high fuel utilization was also studied. After analyzing the critical condition of Ni oxidation, the cell output voltage higher than the critical electromotive force of Ni oxidation was proposed as the safe operating condition to prevent local oxidation of anode. Based on the cell samples and test parameters used in this work, it was found a high efficiency of over 50% was corresponding to the fuel utilization range of 77% to 90%. And the maximum electrical efficiency was always corresponding to Ufuel＝87.10%. Although the operating conditions corresponding to the maximum efficiency of SOFC cells or stacks with different materials, structures, and fabrication processes may vary, the measurement and evaluation methods, as well as the judgment of the safe operating condition proposed in this study, are still helpful. In practical application, the operating conditions could be determined based on such testing results according to the importance of efficiency, power and long-term stability. Keywords solid oxide fuel cell; high efficiency; high fuel utilization; local oxidation of anode; safe operating condition

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Section: 电池阳极安全运行条件unclassified